The above message appears in /var/adm/messages.
This can happen, for example, when the ATM lane device is set to promiscuous mode by running snoop -d lane0.
Do not let the ATM lane device run in promiscuous mode and do not ignore the warning about it.
A broadcast over ATM LAN Emulation is emulated by the broadcast and the unknown server (BUS) for the emulated LAN. If the Sun command transmits its ARP request, some switch implementations for LANE repeat the ARP request over the bus_forward channel, so that it can be seen on the local interface, again:
----- ATM AAL5 Header ----- Packet 1 arrived at 12:12:30.42 Packet size=66 bytes TRANSMIT : VC=75 LANE Data Frame Type=0x0806 (ARP) ARP: ----- ARP/RARP Frame ----- ARP: ARP: Hardware type = 1 ARP: Protocol type = 0800 (IP) ARP: Length of hardware address = 6 bytes ARP: Length of protocol address = 4 bytes ARP: Opcode 1 (ARP Request) ARP: Sender's hardware address = 8:0:20:82:8f:91 ARP: Sender's protocol address = 192.168.31.54, lab054-lane0 ARP: Target hardware address = ? ARP: Target protocol address = 192.168.31.50, lab050-lane0 ARP: ----- ATM AAL5 Header ----- Packet 2 arrived at 12:12:30.42 Packet size=66 bytes RECEIVE : VC=76 LANE Data Frame Type=0x0806 (ARP) ARP: ----- ARP/RARP Frame ----- ARP: ARP: Hardware type = 1 ARP: Protocol type = 0800 (IP) ARP: Length of hardware address = 6 bytes ARP: Length of protocol address = 4 bytes ARP: Opcode 1 (ARP Request) ARP: Sender's hardware address = 8:0:20:82:8f:91 ARP: Sender's protocol address = 192.168.31.54, lab054-lane0 ARP: Target hardware address = ? ARP: Target protocol address = 192.168.31.50, lab050-lane0 ARP: |
----- ATM AAL5 Header ----- Packet 3 arrived at 12:12:30.42 Packet size=66 bytes RECEIVE : VC=84 LANE Data Frame Type=0x0806 (ARP) ARP: ----- ARP/RARP Frame ----- ARP: ARP: Hardware type = 1 ARP: Protocol type = 0800 (IP) ARP: Length of hardware address = 6 bytes ARP: Length of protocol address = 4 bytes ARP: Opcode 2 (ARP Reply) ARP: Sender's hardware address = 8:0:20:8c:4e:f0 ARP: Sender's protocol address = 192.168.31.50, lab050-lane0 ARP: Target hardware address = 8:0:20:82:8f:91 ARP: Target protocol address = 192.168.31.54, lab054-lane0 ARP: |
Normally, the reflected ARP Request is suppressed. If the lane device is set to promiscuous mode, all packets are passed to upper layers, and so the upper instances receive Sun's own packet and raise this message:
Feb 10 12:12:30 sissi unix: IP: Hardware address '08:00:20:82:8f:91' trying to be our address 192.168.031.054! |